Drip lip tubing



Oct. Y11, 1938'. yT. A. GRAHAM ET AL DRIP LIP TUBING Filed Dec. 21, 1936A Patented occ-11,1938

DRIP LIP TUBING Thomas A. Graham, Ellwood City, Pa., and Herbert W.Mollison, Iulighland Park,v Ill., assignors to National Tube Company, la corporation of New Jersey Application December 21, 1936, Serial No.117,104

1 Claim. (Cl. 257-179) Figure 3 is a section on line III-III of FigureReferring -to the accompanying drawing, the numeral 4 indicates a.tubular articley which is adapted to be used in milk coolers, liquidregenerators and the like. A seamless tube 6, prefer- 29 'ably made ofstainless steel, comprises the outer surface of the tubular article 4.Means are provided for causingliquids poured onto the tubular article 4to flow or drip therefrom at a given place in the wall of the tube' 6'and may comprise a fin or rib-like drip 1ip,8 which preferably projectsradially therefrom. The tube '6 is formed in such a manner that theentire wall thereof is distorted at the drip lip 6 but-the remainder ofthe wall of the tube'6 remains round. This drip lip is preferably formed.by making a fold in. the side wall of the tube.

In order to provide a readily and easily cleaned bore for the tubulararticle L a tube Ill'is secured inside the tube 6. The tube i0 ispreferably made of stainless steel and is provided with a smoothlylpolished inside surface. The tube l0 is within the tube 6 ,and securedthereto by means of sweating or welding, or by drawing or pressing byanyother suitable means so that the two tubes -io fit tightly tgetherand are made integral. The

outer surface of the tube I0 shouldbe in intimateV contact with,substantially all of 'the inner surface of the tube 8. Then, due to themetallic composition of, and intimate contact between, the tubes 6 andl0, heat is readily transferred between the inner and outer surfaces ofthe tubular article 4. The lengths of the tubes 6 and I0 are preferablyadjusted, as shown in the drawing, so that the tube I0 extends beyondboth ends of the tube 6.

The tubular article 4 has been tested and found to` transfer heatbetweenthe inner and outer surfaces thereof with .a minimum amount of heatloss. l

The drip lip 8 is an important feature of the tubular article 4 as anyliquids ,poured over the tubular article y4 tend to ow orvdriptherefrom. In actual use the tubular articles 4 are adapted to carryeither a hot or a Acold liquid in-the tube I0 and are .preferablypositioned immediately above or below one another with the drip lips 8extending downwardly therefrom. ,Y Then. any liquid which is allowed toflow onto the uppermost one' of the tubular articles 4 ows over themaximum amount of surface area lof each of the Itubular articles 4 sothat a maximum amount of heat can 'be transferred between their innerand outer surfaces.

While we have shown and described a specific embodiment of ourinvention, it will .be underregenerator, said unit comprising a tubeprovided v with a. radially outwardly extending rib-.lillev drip lip inthe wall thereof, said drip lip comprising an outwardly bent portion ofsaid tube extending longitudinally and continuously. thereof, and asecond tube-securely assembled within the mst named tu e sothat theouter surface of said sec i ontacts substantially the entire inner

